gui: UI improvements

- Make use of addHeaderView of ListViews, instead of using embedded
  ListViews
- Use action bar icons as an entry point for settings, refresh, and add
  functions

Change-Id: I6db1cf1a84271a224cf777e06262380afca49709
diff --git a/app/src/main/res/menu/menu_log.xml b/app/src/main/res/menu/menu_log.xml
index a530929..2f7c0a3 100644
--- a/app/src/main/res/menu/menu_log.xml
+++ b/app/src/main/res/menu/menu_log.xml
@@ -1,13 +1,12 @@
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    tools:context=".NfdLogActivity">
+    xmlns:app="http://schemas.android.com/apk/res-auto">
 
     <item
         android:id="@+id/action_log_settings"
+        android:icon="@drawable/ic_action_settings"
         android:title="@string/log_settings"
         android:orderInCategory="100"
-        app:showAsAction="never"
+        app:showAsAction="always"
         />
 
 </menu>